摘要
为研究温度-轨道不平顺组合激励下千米级矮塔斜拉桥上无砟轨道的行车安全,根据运营环境确定温度荷载工况,并采用ANSYS进行静力分析,确定最不利温度荷载工况。基于车-轨-桥耦合动力分析理论,分析温度-轨道不平顺组合激励下千米级的矮塔斜拉桥上无砟轨道行驶高速列车的动力响应,计算不同行车速度对车辆和桥梁动力响应的影响,并根据现有规范标准,评价千米级的矮塔斜拉桥上无砟轨道的行车安全,提出温度-轨道不平顺组合激励下桥上安全行车的舒适行驶速度范围。分析结果表明:以350km/h设计行车速度过桥时,动车、拖车垂向加速度最大值分别为0.8 m/s^(2)和0.66 m/s^(2),各动力响应数据均处于优良水平,满足相关规范要求;车体的加速度最值与行车速度呈正相关趋势;行车速度为400 km/h时,动车车体垂向加速度最大值为0.95 m/s^(2),是行车速度为250 km/h的1.48倍;当车速达到400 km/h时,Sperling舒适性指标由“优秀”转为“良好”,行车舒适度相对较差。为保证桥上行车安全,建议行车速度不超过400 km/h。
In order to study the driving safety of ballastless track on a short tower cable-stayed bridge of kilometer class under combined temperature-track upset excitation,firstly,the temperature loading condition is determined according to the operating environment,and ANSYS is used for static analysis to determine the most unfavorable temperature loading condition.The dynamic response of high-speed trains,the effect of different travel speeds on the dynamic response of vehicles and bridges is calculated,and the travel safety of ballastless track on kilometer-class short tower cable-stayed bridges is evaluated according to the existing code standards,and a comfortable travel speed range for safe travel on bridges under combined temperature-track upset excitation is proposed.The analysis results show that:when crossing the bridge at 350 km/h design travel speed,the maximum values of dynamic car and trailer vertical acceleration are 0.8 m/s^(2) and 0.66 m/s^(2),respectively,and all the dynamic response data are at excellent level and meet the requirements of relevant specifications;the acceleration maximum value of the car body is positively correlated with the travel speed;at the travel speed of 400 km/h,the maximum value of dynamic car body vertical acceleration is 0.95 m/s^(2),which is 1.48 times of the travel speed of 250 km/h;when the speed reaches 400 km/h,the Sperling comfort index is changed from“excellent”to“good”,and the travel comfort is relatively poor.In order to ensure the safety of traffic on the bridge,it is recommended that the travel speed should not exceed 400 km/h.The conclusion of this study can provide reference for laying ballastless track on kilometer-class short tower cable-stayed bridge.
作者
李鹏鑫
邢书科
王兆刚
郭玉鹏
杨宇栓
杨荣山
LI Pengxin;XING Shuke;WANG Zhaogang;GUO Yupeng;YANG Yushuan;YANG Rongshan(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;Shanghai Civil Engineering Co.,Ltd.of CREC,Shanghai 201906,China;Shandong Luqiao Group Co.,Ltd.,Ji'nan 250101,China;Shandong Railway Investment Holding Group Co.,Ltd.,Ji'nan 250101,China)
出处
《铁道标准设计》
北大核心
2024年第1期72-79,共8页
Railway Standard Design
基金
山东省路桥集团有限公司科研项目(R110122H01161)
中铁上海工程局集团有限公司科研项目(R110122H01023)
山东铁路投资控股集团有限公司科研项目((2021)ZJTL-QT-001)。
关键词
高速铁路
斜拉桥
无砟轨道
组合不平顺
动力响应
high speed railway
cable-stayed bridge
ballastless track
combination irregularity
dynamic response
